Roughening machine



Jan. 28, 1930; F. E. JOHNSTON EI'AL 1,745,100

ROUGHENING MACHINE Filed Oct. 25. 1928 2 Sheets-Sheet 1 5.2-1

yum! l Cased.

I ATTORNEY.

Jan. 28, 1930. F. E. JOHNSTON ET AL ROUGHENING MACHINE Filed Oct. 25.

1928 2 Sheets-Sheet 2 INVENTOR5. 2 114 2.. Q imsiok )Yekm: \l Cmi. BY

/ I ATTORNEY.

Patented Jan. 28, 1930 FRAN OH ST .Q E BQIT A D -Q Q J- G AS Q QMU US ICHI A ROI HE G vMeelfll i Application filed October 25, 1928. Serial No. 314,931.

Our invention relates to a new and useful improvement in a roughen-ing machine adapted for use in roughening the surface of concrete structures and the removal of the laitance therefrom, preparatory to applying the cement finlsh.

It is an object of the present invention to provide a machine of this class which will be simple in structure, economical of manufacture and highly efiicient in use.

Another object 'Ofthe invention is the provision of a machine of this class having a plurality of contact members in spaced relation andoperable in unison at the same time.

It is another object of the'invention to provide a machine of-thisclass whereby alarge area of the concrete surface may be operated upon at the same time by a .single operatorl Other objects will appear hereinafter.

The invention consists in the combination andarrangement of parts hereinafter described and claimed.

The invention will be best understood by a reference to the accompanying drawings, which form apart of this specification, and in which,

Fig. l is a side elevational view of the invention with parts broken away and parts shown in section.

Fig.2 is a view taken online 2-2 o-f-Fig. 1.

Fig. 3 is a ,viewtaken on line 3-3 of Fig. 2.

Fig. 4 is a viewtaken on line 44 of Fig. 3.

Fig. 5 isa view taken on line 55 of Fig. 4.

F ig. 6 is a view takcnon line 6--6 of 3.

Fig. 7 is a fragmentary sectional View taken on line 77 of Fig. 6.

Fig. 8 is an enlarged fragmentary sectiona l view taken on line 8-8 of Fig. 3.

concrete slabs ture has been poured, arising -to-the surface, will carry with lbtlle Fig. 9 is a view taken on line 9-9 of Fig. 3. Fig. 10 is an enlarged sectional view taken on line 10-10 of Fig. 3.

Fig. 11 is aview'ta ken on line 1111 of. Fig. 10.

It has been experienced that inthe formationof concrete structures and particularly which are positionedin a horithat after the concrete structhe excessive water zontal plane,

"provided the roughening machine which serves to give to the surface, the desired characteristic, as well as remove the layer of laitance.

the'invention we "have provided-a structure having a base 17, side walls 18 and 19, a rear wall 20 and a front wall 2-1,- this front wall 21 bein shorter than the rear wall 20 and angular y turned as at 22. Mounted on a forwardextension of the base 17 is an electric motor 23 having .a gear 24fixedly1nounted on its shaft 25. A chain belt '26 passes around the gear 24 and serves to connect it to the gear 27, which is mounted on the shaft 28. 'Fixedly mounted on the shaft 28 and rotatable therewith upon rotation of said gear '27, is a gear 29, which :is connected by means of the chain belt 30 to the .gear '31, which is fixedly mounted upon the shaft '32.

Fixedly mounted on-the shaft 32 are a plurality of cam arms-33having the ends 34 angu- .larly turned in opposite directions. Fixedly mounted on the shaft '32 is a gear 35,-meshing with a gear 36, which is fixedly mounted on the shaft 37. Fixedly mounted on the shaft 37 are a plurality of cam arms 38, similar in structure to the cam arms 33. As shown in'Fig. 2 the cam arms on each of the shafts are in staggered relation.

Extending between the side and end walls is a partition or bed'39 having aplurality of .openings :-formed therein, in which engage .extensionsornecks 40 in blocks i1. Each of 'theseblocks is provided witha pair oft-runnions/i2 vvon opposite sides thereof engaging between blocksa3 andll, which are secured to thGIbBdBQ. zProvidedsin each of-theblocks 4:1 is a cylindrical openingffiinto which projectsa key -.extending.intothe axial. groove 47 formed in the periphery of the hammer shank 48. Each of these hammer shanks is provided on its lower end, with a flange 49 and with a tapered socket 50 which communicates with the wedge shaped opening 51. Engaging in the Sockets 50, is a tapered shank 52 having the contact point 53 formed thereon. A suitable wedge may be driven into the opening 51 for effecting removal of the contact shank 52 from the socket 50. A disc 54 is provided with an opening 55 which is tapered to fit the taper of the contact point 53, a flange 56 projecting outwardly from one face of the disc 54 around the opening 55. A collar 57 engages one surface of the flange 49 and also the disc 54 and serves to retain the disc 54 in position so as to prevent the contact shank 52 from unduly being removed from the socket 50, a set screw 58 serving to retain the locking member 57 inoposition.

Fixedly mounted on each of the hammer shanks 48, intermediate the ends thereof, is a collar 60 having a neck 61 projected from one side thereof. Mounted on this neck 61 is a bushing 62 on which is positioned a roller 63; a set screw. 64 and a washer 65 securing these parts in position. Each of these hammer shanks is projected through an opening 66 formed in the base 17 and also between spaced blocks 67 and 68, each of which is provided with a semi-cylindrical recess 69. Leaf springs 70 and 71 secured at opposite sides of the housing,'serve to press these blocks 67 and 68 into engagement with the hammer shanks 48 and serve as bearings therefor. Bars 71 overlap the edges of the blocks 67 and 68 and serve to retain the same in engagement with the base 17.

In operation, when the cam shafts 32 and 37 are set into rotation, the cam arms will engage the rollers 63 and serve to move the hammer shanks 48 upwardly against the tension of the leaf springs 72, which engage the upper ends thereof, the key 46 riding in the groove 47 during this movement. After the cam arms ride off of the rollers 63, the hammer shank will be violently driven downwardly by the tension of the leaf spring 72,.

so as to deliver a blow to the cement surface, with which contact the traction wheels ,73

and 74, which serve to support the structure,

A handle 75 braced by the brace 76 serves as a means for pushing the device over the surface to be treated. Positioned about each of the hammer shanks 48,adj acent the lower end, is a coil spring 77 which serves as a shock absorber, as the hammer shanks 48 are driven downwardly by the tension of the spring 72.

Inasmuch as the device resembles a .Ve hicle being propelled over the surface to be treated, whenin motion it is necessary that angular movement of the hammer shanks be provided for. To this end the blocks 41,

which serve as bearings, are rockingly mounted on the trunnions 22. Similarly, because the blocks 68 and 67 are loosely positioned and spring held by the spring 7 O in engagement with the hammer shanks 48, angular movement may be permitted within certain degrees suflicient to compensate for the horizontal movement of the hammer shanks, when, upon their vertical movement, they come violently into contact with the surface treated.

With a machine constructed in this manner, a rapid roughening of a surface maybe effected with a minimum amount of labor.

While we have illustrated and describedthe contact members vertically upwardly; and

resilient means for moving said contact members vertically downwardly upon disengagement of said raising means.

2. A machine of the class described comprising: a base; a plurality of contact memers reciprocally mounted on said base and tiltable relatively thereto within predetermined limits; a pluralityof cam members; means for rotating said cam members; means on said contact members for engaging said cam members, the rotation of said cam members while in engagement with said means effecting vertical movement of said contact members; and resilient means for moving said contact members downwardly into engagement with the surface over which propelled upon disengagement of said contact members.

3. A machine of the class described comprising: a base; a plurality of contact members reciprocallymounted onsaid base and tiltable relatively thereto within predetermined limits; a plurality of cam members; means for rotating said cam members, the rotation of said cam members while in engagement with said means effecting vertical movement of said contact members; resilient.

means for moving said contact members downwardly into engagement with the'surface over which propelled upon disengagement of said contact members; and resilient means for resisting downward movement of said contact members beyond a predetermined distance.

4. A machine of the class described comprising: a supporting body; a plurality of contact members on said supporting member tiltable relatively thereto and vertically movable relatively thereto; means for moving said contact members positively in one direction; resilient means for moving said contact members in the opposite direction upon movement of said first named moving means {0 inoperative relation to said contact memers.

5. A machine of the class described comprising: a supporting body; a plurality of contact members on said supporting member tiltable relatively thereto and vertically movable relatively thereto; means for moving said contact members positively in one direction; resilient means for moving said contact members in the opposite direction upon movement of said first named moving means to inoperative relation to said contact members; and yieldable means for resisting movement of said contact members by said resilient means beyond a predetermined distance.

In testimony whereof We have signed the foregoing specification.

FRANK E. JOHNSTON. NELSON J. COASH. 

